Q: What is a firearm curio or relic?
Firearm curios or relics include firearms which have special value to collectors because they possess some qualities not ordinarily associated with firearms intended for sporting use or as offensive or defensive weapons. To be recognized as curios or relics, firearms must fall within one of the following categories:

1. Have been manufactured at least 50 years prior to the current date, but not including replicas thereof; or

2. Be certified by the curator of a municipal, State, or Federal museum which exhibits firearms to be curios or relics of museum interest; or

3. Derive a substantial part of their monetary value from the fact that they are novel, rare, bizarre, or from the fact of their association with some historical figure, period, or event.

I don't think the last part is reserved for individual arms formally owned by historic people. Is it possible that this is the clause used to qualify guns of former Eastern Bloc Countries like the CZ 82, P64, Yugo 59/66 SKS . or even the Walther P1. The fall of the Iron Curtain being the historical event.